i feel like marty and i missed a ripe business opportunity when we failed to hire our kids out to test parks and homes for safety. because when you combine marty's free-range parenting style and the natural athletic abilities of most children, boundaries will be tested. there were many a time i look at one of my children atop or inside something and wonder at length how they ever managed the maneuver. a few times i consulted marty asking how she thought they managed that. she'd look at the child, then at me and say she found it best not to think too hard on those things. there's nothing fruitful to come of it and it can bend the nerves.